Huawei OSN1500 2500 3500 7500 series universal service board, 12 STM-1 optical interface board with 12 L-1.2 80km SFP module

SKU: 3969 Category:


SSN1SLT125 overview

Feature Code

The number code that follows the board name in the bar code is the feature code of the board. The feature code of the SLT1 indicates the type of optical interface.


Board Feature Code Type of Optical interface
SSN1SLT123 23 S-1.1
SSN1SLT124 24 L-1.1
SSN1SLT125 25 L-1.2
SSN1SLT110 10 S-1.1
SSN1SLT120 20 S-1.1
SSN1SLT121 21 L-1.1
SSN1SLT122 22 L-1.2
Port type Description
S-1.1 15 km STM-1 two-fiber bidirectional optical interfaces
L-1.1 40 km STM-1 two-fiber bidirectional optical interfaces
L-1.2 80 km STM-1 two-fiber bidirectional optical interfaces
S-1.1 15 km STM-1 single-fiber bidirectional optical interfaces
L-1.1 40 km STM-1 single-fiber bidirectional optical interfaces


The SLT1 is available in one functional version, namely, N1.


Board Start Version
N1SLT1 V100R003C01


SSN1SLT125 Application

The SLT1 is a line board. The SLT1 can be used on the OptiX OSN equipment series to transmit and receive STM-1 optical signals. The SLT1 converts the received optical signals into electrical signals and sends the electrical signals to the cross-connect side. In addition, the SLT1 converts the electrical signals sent from the cross-connect side into optical signals and transmits the optical signals.

SSN1SLT125 Functions and Features

The SLT1 transmits and receives STM-1 optical signals, performs O/E conversion for the STM-1 optical signals, extracts and inserts overhead bytes, and generates alarm signals on the line.

Functions and features of the SLT1

Function and Feature SLT1
Basic functions Transmits and receives 12xSTM-1 optical signals.
Specifications of the optical interface Supports S-1.1, L-1.1 and L-1.2 standard optical interfaces whose characteristics comply with ITU-T G.957.
Specifications of the optical module
  • Supports the detection and query of the information about the optical module.
  • Provides the ALS function. The optical interface supports the setting of the on/off state of a laser.
  • Supports the usage and detection of the SFP optical module, which facilitates the maintenance of the optical module.
  • Supports the single-fiber bidirectional optical module, and the single-fiber bidirectional optical module does not support loopbacks at the optical interface by using fiber jumpers.
Service processing Supports the VC-12 services, VC-3 services, and VC-4 services.
Overhead processing
  • Processes the section overheads of the STM-1 signals.
  • Supports the transparent transmission and termination of the path overheads.
  • Supports the setting and query of the J0, J1, and C2 bytes.
  • Supports one to twelve channels of ECC communication. Port 1 to port 8 supports the ECC communication by using bytes D1-D12. Port 9 to port 12 support the ECC communication by using bytes D1-D3.
Alarms and performance events Reports various alarms and performance events, which facilitates the management and maintenance of the equipment.
Protection schemes Supports the Two-fiber ring MSP, Four-fiber ring MSP, Linear MSP, SNCP, SNCTP, and SNCMP.
Maintenance features
  • Supports inloops and outloops at optical interfaces.
  • Supports inloops on VC-4 paths.
  • Supports warm resets and cold resets. The warm reset does not affect services.
  • Supports the query of the manufacturing information of the board.
  • Supports the in-service loading of the FPGA.
  • Supports the upgrade of the board software without affecting services.
  • Supports the PRBS function.


SSN1SLT125 Valid Slots

The slots valid for the SLT1 vary with the cross-connect capacity of the subrack.


The slots valid for a board are determined by the following factors:

  • Slot bandwidth
  • Cross-connect capacity
  • Board version
  • When the cross-connect capacity is 20 Gbit/s:
    • The N1SLT1 can be installed in slots 12 and 13 in the OptiX OSN 1500A subrack.
    • The N1SLT1 can be installed in slots 11-13 in the OptiX OSN 1500B subrack.
Optical Interface Parameter
Parameter Value
Nominal bit rate 155520 kbit/s
Line code pattern NRZ
Application code L-1.2
Transmission distance (km) 40 to 80
Type of fiber Single-mode LC
Operating wavelength range (nm) 1480 to 1580
Launched optical
power range (dBm)
-5 to 0
Receiver sensitivity (dBm) -34
Minimum overload (dBm) -10
Minimum extinction ratio (dB) 10
Maximum -20 dB spectral width (nm) 1
Minimum side mode suppression ratio (dB) 30
Mechanical Specifications
Dimensions (mm) 25.4 (W) x 235.2 (D) x 261.4 (H)
Weight (kg) 1.3

Additional information

Weight 3.0000 kg
Dimensions 37.5000 × 34.0000 × 7.5000 cm


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